//拦截器

package com.sifang.interceptors;

import com.sifang.utils.JwtUtil;
import com.sifang.utils.ThreadLocalUtil;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;

@Component
public class LoginInterceptor implements HandlerInterceptor {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
         //令牌验证
        String token = request.getHeader("Authorization");
        //验证token
        try{

            //从redis中获取相同的token
            ValueOperations<String, String> operations = stringRedisTemplate.opsForValue();
            String redisToken = operations.get(token);
            if(redisToken==null){
                //token失效
                throw new RuntimeException();
            }

            Map<String,Object> claims = JwtUtil.parseToken(token);

            //把业务数据存储在ThreadLocal中
            ThreadLocalUtil.set(claims);

            return true;
        }catch (Exception e){
            response.setStatus(401);
            return false;
        }
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //清空ThreadLocal中的数据
        ThreadLocalUtil.remove();
    }
}
